Hoist



May 2,' 1944.

C. E. GOLDUP HOIST Filed April 6, 1943 3 Sheets-Sheet 1 -v 'o P C. E.GOLDUP May 2, 1944.

HOIST Filed April e, 194s- 3 Sheets-Sheet 2 Patented May 2, 1944 anniHOIST Cecil Edgar Gol'duD, Ashford, England, assigner to StanhayLimited, Ashford, England Application April 6, 1943,A SerialNo.148`2,004 In Great Britain March 3, 1942 4 Claims.

This invention has for its object to provide an improved mobile orstatic crane or hoist particularly designed for loading and unloadinggoods, packing cases, machinery parts and other rticles and capable of avariety of uses in which the speeding. up of the handling of goods is adesideratum.

The invention consists in a hoist comprising a framework, a crane arm orjib pivoted thereon, a fluidpressure operated piston, and linkage con-Vnecting the piston and jib for the purpose of raising and lowering thelatter by movement of the piston.

The invention also consists in a portable hoist comprising a vehicle, acrane arm or jib pivoted to a framework thereon, a fluid pressureoperated hoist on the vehicle, and linkage cou-A pling the hoist and thejib for the purpose of raising and lowering the latter.

Further features of the invention will be apparent from the descriptiongiven hereafter.

The accompanying drawings illustrate two modes of carrying out theinvention.

Figure 1 is a side elevation (in part diagrammatic) of one form ofportable hoist in accordance with the invention.

Figure 2 is a rear elevation.

Figure 3 is a view of a detail on a larger scale.

Figure 4 is an end view of a part of Figure 1 on a somewhat largerscale, and

Figure 5 is a view similar to Figure 1 showing ing a further form ofhoist in accordance with the invention.

In carrying my invention into eiect in one convenient manner whenproducing a portable or mobile hoist and as illustrated in Figures 1 to4, I construct upon the chassis a of a tractor b a framework of channeliron or other light but strong elements or units, the frameworkcomprising two uprights c near the front end of the chassis to which ispivoted a crane arm or jib d formed of channel iron with suitablebracing rods or of other convenient construction and having at its outerend a hook e or other means by which the articles to be handled may besuspended from the jib. The pivoted shaft d 'of the jib is provided withtwo members f, extending radially therefrom, and each of which isconnected by a link g to a lever h mounted upon a transverse shaft ipivoted in the framework near the rear end of the chassis and the saidshaft is connected by swinging links lc to the piston rod l of a pistonoperating within a cylinder m to which compressed air is supplied forthe purpose of operating the piston. The compressed air for operatingthe hoist is contained ina reservoir (or reservoirs) n charged by asuitable compressor o driven uponthe tractor and from the reservoir thecompressed air isled by piping (not shown) to a contact valve p locatedconveniently for operation by the driver and adapted to control' thesupply of compressed air to and from the cylinder. The arrangement issuch that power from the pneumatic hoist is transmitted to the crane armfor the purpose of raising and lowering the same as desired by way ofthe swinging links, rocking shaft lever and linkf or rod arrangementabove referred? to.

If necessary or desirable the framework may be' extended rearwardly ofthe pneumatic hoist so as tov take a counterpoise should this be foundnecessary or desirable, or as shown in the drawings, the pneumaticcylinder and reservoirs may supply the necessary counterweight.

While the invention of a mobile hoist has been described as applied to atractor which is very convenient for the purpose of transporting loadssuspended upon the crane arm it will be understood that the hoist may beapplied to a truck or any other type of vehicle and the compressor forsupplying the hoist may be driven by electric motor, petrol engine, orother convenient prime mover, or, alternatively, the receiver forsupplying the pneumatic hoist may be charged periodically withcompressed air from an outside source, for example, the pipe system of afactory.

It is preferred to provide the hoist with a suitable safety arrangementin order to prevent the fall of the crane arm in the event of an airpipe breaking or 'of any other accident leading to a fall in pressure inthe system, the safety arrangement also being useful where it may bedesired, for example, to retain the crane arm in its elevated positionovernight or for any continuous period. In the particular exampleillustrated this object is achieved by providing upon the crane arm twoquadrant shaped ratchets r each of which is associated with a pawl rmounted upon a transverse shaft r2 carried in the vertical members c.The free ends of the pawls are actuated by pins r3 on fingers r4connected by a cross member T5 and pivoted to the framework by a crossshaft r6. Acting upon the cross member f5 is the piston rod s of apiston s arranged in a cylinder s2 connected to the reservoir supplyingcompressed air to the pneumatic hoist, the piston being controlled by aspring s3, the tension of which may be variable by movement of a capmember s4 in relation to the cylinder s2. The arrangement is such thatwhen the pressure obtains in the system the pawls r are maintained outof engagement with the quadrants r and the crane arm is freely movableas required. Should, however, the pressure fall for any reason thespring s3 comes into operation to lower the members r4 so that the pawls(which are suitably counterweighted) move into engagement with thequadrantsr and prevent downward movement of the crane arm. In some casesthe pawls may be operable by hand or foot mechanism instead ofautomatically by the air pressure as above described. safety device tothe spindle d it may, if desired, be applied to the shaft z'.

Figure 5 shows a modified construction in ac,-` cordance with theinvention and as similar parts to those shown in Figure 1 are markedwith' similar reference characters it is thought that any detaileddescription will be unnecessary. There are, however, shown in this guretwo gauges t arranged upon the framework, namely, a weight gauge whichmay be connected with the pneumatic cylinder m (it being evident thatthe pressure Within the cylinder may be a measure of the weightsupported by the crane arm) and a pressure gauge connected with thereservoir m.

It will be understood that a hoist such as is above described avoids thenecessity for any winding gear, winding cables, gear wheels and brakessuch as are normally to be found in cranes and hoists as hithertoconstructed, and while the invention has been particularly described inrelation to a mobile unit, the principles of the invention may beequally applied to a static crane with slewing jib or otherwise forwarehouse, factory or other purposes. For example, instead of mountingthe jib and its fluid pressure operating mechanism upon a vehicle, itmay be mounted on Moreover, instead of applying the a turntable, or maybe otherwise arranged to enable the jib to be slewed as or if required.

The invention is not limited to any particular construction of frameworknor to any particular arrangement of pneumatic or hydraulic cylinder foroperating the crane connected therewith by suitable intervening linkageas such details may be varied according to the nature of the unitemployed, the precise purpose for which the hoist is to be used or anypractical requirements that Amay have to be fulfilled.

Iclaim: 1. A portable hoist comprising a vehicle, a

f channel iron framework on the chassis thereof comprisingV twouprights, a jib arm pivoted in said uprights, members extending radiallyfrom lthe pivotal spindle of the jib arm, links connecting said memberswith levers mounted upon a spindle also carried by the framework on thevehicle and floating links connecting said spindle with the piston rodof a fluid pressure actuated piston operating in a cylinder.

2. A portable hoist according to claim 1 comprising a reservoirsupplying compressed air to the cylinder and a compressor driven by theprime mover of the vehicle for supplying compressed air to saidreservoir.

3. A portable hoist according to claim 1 having safety means forpreventing the fall of the crane arm in the event of a fall in pressureoccurring in the uid pressure system.

4. A portable hoist according to claim 1 having safety means forpreventing the fall of the crane arm in the event of a fall in pressureoccurring in the iiuid pressure system, said `means being actuatedautomatically on such fall of pressure.

CECIL EDGAR GOLDUP.

